⬧ TOOLSNOVAHUB — 59+ FREE TOOLS
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Free Online Tools
Fast • Secure • Privacy Friendly • No Sign-up
IP, DNS, WHOIS, Email, QR, Password & network tools — all free, no account, no data stored. Built for developers, IT teams & cybersecurity professionals.
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IP & Network
IP Lookup, My IP, Bulk IP, ASN
🗄️
DNS & Domain
DNS Lookup, WHOIS, MX, A/AAAA Records
📧
Email Security
SPF, DKIM, DMARC, Email Checker
🛡️
Web & HTTP
SSL, Security Headers, HTTP Headers
📡
Network Diagnostics
Ping, Traceroute, Port Scanner
📐
Calculators
CIDR, Subnet, IPv6 Calculator
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Developer & Generators
QR, UUID, Password, MAC Generator
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Utilities
Timezone, Age Calculator
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🎯 What Can You Do With ToolsNovaHub?
59+ free tools — real-world tasks, zero signup
🔍
Investigate a Suspicious IP
Trace any IP to its country, ISP, ASN, hosting provider, and security risk score. Detect VPNs, Tor nodes, and datacenter addresses instantly.
📧
Diagnose Email Delivery Problems
Check MX records, SPF/DKIM/DMARC configuration, and blacklist status in one workflow — identify exactly why emails bounce or land in spam.
🌲
Research Internet Infrastructure
Look up any Autonomous System Number to see BGP routing, IP prefixes, peers, and RIR data. Understand who operates any network on the internet.
🗄️
Troubleshoot DNS Issues
Query A, MX, TXT, CNAME, NS, SOA records. Check if DNS changes have propagated globally. Find a domain’s PTR hostname with reverse DNS lookup.
📐
Plan & Calculate IP Networks
Calculate CIDR notation, subnet masks, host ranges, and broadcast addresses. Convert IPs between binary/decimal/hex. Design network topology with VLSM.
🔐
Secure Accounts & Generate Content
Generate cryptographically strong passwords with entropy analysis. Create QR codes for URLs, WiFi, vCards & UPI. Plan meetings across 100+ time zones.
🛡️
Audit Your Website's Security
Check SSL certificate history and issuer, grade HTTP security headers (HSTS, CSP, X-Frame-Options), and verify DKIM signing before or after a launch. See our full security checklist.
📡
Run Network Diagnostics
Generate ready-to-run ping, traceroute and port scan commands for any host. Test SMTP connectivity on ports 25, 587 and 465, and read the raw SMTP banner a mail server exposes.
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✨ Latest & New Tools
Recently added to ToolsNovaHub
📅 Recent Updates
What we've improved lately
🛠️ NEW TOOL
Trace a URL's full redirect chain, hop by hop — every HTTP status code and Location header, up to the final destination.
🛠️ NEW TOOL
Check a domain's TLSA (DANE) records for HTTPS, SMTP, and other services — certificate usage, selector, and matching type decoded.
📚 NEW
DNS-based certificate trust that can operate independently of the public CA system — and why almost none of it works without DNSSEC.
📚 NEW
A step-by-step implementation guide for deploying TLSA records on mail delivery.
🛠️ NEW TOOL
Check a domain's live DNS cache and TTL status across multiple public resolvers, and spot cache inconsistencies.
✅ NEW
Every DNS flush command in one place — Windows, macOS, Linux, Chrome, and Firefox.
🛠️ NEW TOOL
Test your connection for DNS leaks — see which resolvers your browser is really using and check for WebRTC exposure.
📚 NEW
A layer-by-layer action plan covering VPN, OS, browser, and ongoing verification.
📚 NEW
Why DNS resolution creates a structural opportunity for leaking, and how it differs from other privacy leaks.
🛠️ NEW TOOL
Check whether a domain has DNSSEC enabled and correctly validating — DS, DNSKEY, RRSIG records and full chain-of-trust status.
📚 NEW
What DNSSEC actually protects against, and why it took over a decade to become widely deployed.
📚 NEW
Signing is only half of DNSSEC — validation is where the real security benefit happens.
🛠️ NEW TOOL
Look up the PTR record for any IP address instantly — verify reverse DNS and mail server FCrDNS setup.
🛠️ NEW TOOL
Check which Certificate Authorities are authorized to issue SSL/TLS certificates for any domain.
📊 ToolsNovaHub vs Other Tools
See why professionals choose us
| Feature | ToolsNovaHub | Typical Free Tools | Paid SaaS Tools |
|---|---|---|---|
| Cost | ✅ Always Free | ✅ Free (limited) | ❌ Monthly subscription |
| Account / Login Required | ✅ No account ever | ⚠️ Often required | ❌ Mandatory |
| Data stored / tracked | ✅ Nothing stored | ⚠️ Often logged | ⚠️ Often logged |
| Ads | ⚠️ Minimal AdSense only | ❌ Heavy / intrusive ads | ✅ Usually ad-free |
| Tools available | ✅ 59+ in one place | ❌ Usually 1–3 tools | ✅ Many tools |
| Bulk IP Lookup (20 IPs) | ✅ Free, CSV export | ❌ Usually paid | ✅ Paid feature |
| Reverse DNS (PTR) | ✅ Included free | ❌ Often missing | ✅ Paid feature |
| CIDR / Subnet Calculator | ✅ Included free | ⚡ Separate site needed | ✅ Usually included |
| Password entropy + crack time | ✅ Free, on-device | ⚡ Basic strength meter only | ✅ Often available |
| QR with logo + custom colors | ✅ Free, browser-side | ❌ Usually watermarked/paid | ✅ Paid feature |
| Mobile friendly | ✅ Fully responsive | ⚠️ Varies widely | ✅ Usually yes |
| Dark / Light theme | ✅ Auto + manual toggle | ❌ Usually light only | ✅ Usually yes |
🏆 Why ToolsNovaHub?
Built by practitioners, used by professionals
ToolsNovaHub is built and maintained independently by a developer with hands-on full-stack development experience, working directly with IP intelligence, DNS infrastructure and web security concepts. Every tool was built to solve a REAL problem: diagnosing a blacklisted mail server, tracing a suspicious IP during a security investigation, verifying a domain's WHOIS before a purchase, or generating a high-entropy password under time pressure.
Unlike tools that wrap a single third-party API and display raw JSON, our tools cross-reference 8+ authoritative data sources — ipapi.co, ipwho.is & ipinfo.io for geolocation triangulation; api.ipify.org for IPv4/IPv6 detection; dns.google (DNS-over-HTTPS) for DNS & DNSBL queries; rdap.org for WHOIS/domain data; crt.sh for Certificate Transparency logs powering SSL Certificate Checker; and openstreetmap.org for map rendering. Results are merged, deduplicated and scored to give you a richer picture than any single API provides.
Privacy first: No input you enter is ever logged, stored or sent to ToolsNovaHub's own servers. IP lookups, DNS queries, email checks, WHOIS lookups and blacklist checks all go directly from YOUR browser to the relevant API — we see only the AdSense impressions from your page visit, nothing else. Passwords and QR code content are generated entirely client-side using your browser's built-in crypto.getRandomValues() and Canvas APIs — they never touch any server.
Always improving: Every tool on this site has educational content explaining not just HOW to use it, but WHY the results look the way they do, what common errors mean, and advanced tips that professionals use. We update tool features and educational content regularly as protocols evolve (RDAP replacing WHOIS, DNSBL landscape changes, new QR standards, etc.).
🔓 No data stored — ever
📈 3 geolocation sources cross-referenced
🔑 Browser-side crypto (password/QR)
● 15 real DNSBL zones checked
🌐 Works on mobile without an app
💡 Request a Tool
We build tools our users actually need
Most of our tools were added because users asked for them. If you need a tool that isn't here yet — a specific network utility, converter, generator or checker — tell us and we'll consider it for the next release.
Recent requests already in our pipeline: JWT Decoder, Hash Generator, multi-language support. Most of our latest tools — Redirect Checker, TLSA Lookup, DNS Cache Checker, DNS Leak Test, and the full set of DNS record lookups — started as user requests.
❓ Frequently Asked Questions
Everything you need to know about ToolsNovaHub
Are all ToolsNovaHub tools completely free? +
Yes — every tool on ToolsNovaHub is 100% free, with no sign-up, no subscription, and no hidden charges. We cover costs through non-intrusive display ads.
Do you store the IPs, domains or emails I look up? +
No. Lookups go directly from your browser to third-party APIs (ipwho.is, ipinfo.io, dns.google, rdap.org, api.ipify.org, etc.). We do not log or store your queries on our servers.
Why do some tools show different results than other sites? +
Different tools use different geolocation databases, which update on different schedules. City-level accuracy varies across providers; country and ISP data is generally more reliable.
How accurate is IP geolocation? +
Country accuracy is typically 95–99%. Region/city accuracy drops to 50–80%. IP geolocation cannot pinpoint an exact address — it shows where the ISP network is registered, not the physical device.
Can I use ToolsNovaHub from my phone? +
Yes. All tools are fully responsive and designed for desktop, tablet, and mobile. The sidebar collapses into a hamburger menu on small screens.
Is the Password Generator safe to use? +
Yes. Passwords are generated entirely in your browser using the Web Crypto API (crypto.getRandomValues). Nothing is transmitted to our servers — the generation is 100% local.
How do I report an incorrect result or a bug? +
Use the Contact page to send us a message. Include the tool name, the input you used, and what result you expected vs. what you saw.
What is the Bulk IP Lookup limit? +
The free Bulk IP Lookup supports up to 20 IPs per batch. You can run multiple batches to cover larger lists. Each lookup queries live APIs in parallel for speed.
What does "No PTR record found" mean? +
It means the IP owner has not configured a reverse DNS (PTR) record. This is normal for residential IPs but a problem for mail servers, which typically need a matching PTR for deliverability.
Do you have an API? +
Not yet — our tools query public free-tier APIs directly from the browser. A future ToolsNovaHub API is on our roadmap. Follow our blog or contact us to express interest.
What is CIDR notation? +
CIDR (Classless Inter-Domain Routing) notation expresses a network address and its size together, e.g. 192.168.1.0/24, where /24 means the first 24 bits identify the network, leaving 8 bits for host addresses (254 usable).
What is a subnet mask? +
A subnet mask is a 32-bit number that separates the network portion of an IP address from the host portion. 255.255.255.0 (/24) means the first three octets identify the network; the last octet identifies individual hosts.
What is DNS propagation and how long does it take? +
DNS propagation is the time it takes for updated DNS records to spread across resolvers worldwide. It typically takes 15 minutes to 48 hours, depending on the record's TTL (Time to Live) value.
What is an ASN? +
An Autonomous System Number (ASN) is a unique identifier assigned to a network or group of networks operated by a single organisation (like an ISP or large company) that follows a common routing policy on the internet.
What is a DNSBL blacklist? +
A DNSBL (DNS-based Blackhole List) is a database of IP addresses known to send spam or engage in malicious activity. Mail servers query these lists in real time to decide whether to accept or reject incoming mail from a given IP.
What is the difference between IPv4 and IPv6? +
IPv4 uses 32-bit addresses (e.g. 192.168.1.1), giving ~4.3 billion unique addresses. IPv6 uses 128-bit addresses (e.g. 2001:db8::1), giving a practically unlimited supply. IPv6 was introduced to solve IPv4 exhaustion.
What is a VPN and does it hide my real IP? +
A VPN (Virtual Private Network) routes your traffic through a server in another location, replacing your real IP with the VPN server's IP. However, WebRTC leaks in browsers can still reveal your real IP — use our My IP tool to check for leaks.
What is WHOIS? +
WHOIS is a protocol for querying databases containing registration information about internet resources like domain names and IP addresses. It tells you who registered a domain, when it expires, and who the registrar is.
Why is WHOIS data sometimes hidden or redacted? +
GDPR and privacy regulations require many registrars to redact personal details (name, address, phone) from public WHOIS records. Domain privacy services also mask registrant information with proxy contact details.
What is an MX record? +
An MX (Mail Exchange) record specifies which mail server is responsible for accepting email for a domain. Without a valid MX record, email sent to that domain will fail to deliver.
What is an SOA record? +
An SOA (Start of Authority) record marks the start of a DNS zone and stores its administrative data — the primary name server, admin contact, serial number, and the refresh, retry, and expire timing values that govern replication. Check any domain's SOA record with our free SOA Lookup tool.
What does the SOA serial number, refresh, retry, and expire mean? +
The serial number is a version counter secondary DNS servers use to detect zone changes. Refresh is how often they check for updates, retry is the shorter interval used after a failed check, and expire is how long a secondary keeps serving the zone before giving up if it can't reach the primary.
What is an SRV record? +
An SRV (Service) record maps a specific service — like SIP, LDAP, or a game server — to a target host and port, along with priority and weight values controlling which server clients try first. Check any service's SRV records with our free SRV Lookup tool.
What is DNS-based service discovery, and where is it used? +
Service discovery through SRV records lets applications find a service's actual server automatically through DNS rather than a hardcoded address. It powers Microsoft Active Directory domain controller discovery, SIP VoIP call routing, LDAP directory lookups, and even Minecraft server connections on custom ports.
What is a PTR record, and what is reverse DNS? +
A PTR record maps an IP address back to a hostname — the reverse of what an A record does. Reverse DNS is widely used by mail servers as a reputation signal, and by security tools for readable connection logging. Check any IP's PTR record with our free PTR Lookup tool.
Why does my mail server need a correctly configured PTR record? +
Receiving mail servers check the sending IP's PTR record and Forward-Confirmed reverse DNS (FCrDNS) as a basic trust signal. A missing or mismatched PTR record is a common, often-overlooked reason legitimate email gets flagged as spam even when SPF, DKIM, and DMARC are all configured correctly.
What is a CAA record, and how does it relate to HTTPS security? +
A CAA (Certification Authority Authorization) record lets a domain owner specify exactly which Certificate Authorities — like Let's Encrypt or DigiCert — are allowed to issue SSL/TLS certificates for that domain. All publicly trusted CAs are required to check it before issuing, meaningfully reducing the risk of a certificate being mistakenly or maliciously issued by an unintended CA. Check any domain's CAA records with our free CAA Lookup tool.
Should I restrict which Certificate Authorities can issue certificates for my domain? +
It's a widely recommended, low-effort security best practice. By default any trusted CA can issue for a domain with no CAA record; adding one — authorizing only the CAs you actually use, such as Let's Encrypt or DigiCert — closes off unnecessary trust in every other CA.
What is DNSSEC and how do I check if it's enabled for a domain? +
DNSSEC (Domain Name System Security Extensions) adds cryptographic signatures to DNS data, letting resolvers verify answers are authentic and haven't been tampered with. Check for a DS record at the registrar and DNSKEY records in the zone — our free DNSSEC Checker verifies both and confirms the full chain of trust validates correctly.
What is SPF, DKIM and DMARC? +
SPF (Sender Policy Framework) specifies which servers may send email for a domain. DKIM (DomainKeys Identified Mail) adds a cryptographic signature to verify the sender. DMARC ties them together with a policy for how to handle failures. All three are TXT DNS records.
What is a PTR record? +
A PTR (Pointer) record maps an IP address to a hostname — the reverse of an A record. PTR records live in the in-addr.arpa DNS zone and are used by mail servers and security tools to identify the owner of an IP.
What is email list hygiene? +
Email list hygiene is the practice of regularly removing invalid, bouncing, or inactive addresses from a mailing list. Good hygiene prevents spam-trap hits, reduces bounce rates, and protects sender reputation and deliverability.
What is UTC? +
UTC (Coordinated Universal Time) is the global time standard that all other time zones are offset from. It replaced GMT as the primary time standard. UTC does not observe Daylight Saving Time, making it ideal as a reference for international scheduling.
What is Daylight Saving Time (DST)? +
DST is the practice of advancing clocks by 1 hour during summer months to extend evening daylight. Not all countries observe DST — India, China, Japan, and most of Africa do not. Our Timezone Converter automatically accounts for DST transitions.
What does a QR code's error correction level do? +
Error correction allows a QR code to be scanned even when partially damaged or covered. Level L (7%), M (15%), Q (25%), and H (30%) — higher levels make codes more reliable but denser. Level H is automatically used when adding a logo overlay.
What is password entropy? +
Entropy measures how unpredictable a password is, expressed in bits. Each extra bit doubles the number of guesses needed to crack it. A password with 60-bit entropy has ~1 quintillion possible combinations — far beyond practical brute-force.
What is FCrDNS? +
Forward-Confirmed reverse DNS (FCrDNS) verifies that a PTR record's returned hostname, when looked up forward (A record), resolves back to the original IP. Mail servers use this two-step check to validate sending infrastructure trust.
What is the difference between a static and dynamic IP? +
A static IP remains constant every time you connect to the internet. A dynamic IP is assigned fresh by your ISP each session and may change regularly. Most home connections use dynamic IPs; servers typically use static ones.
What is a CGNAT address? +
CGNAT (Carrier-Grade NAT) is when an ISP shares a single public IP across multiple customers. Your "public IP" may actually be another layer of NAT. CGNAT IPs typically fall in 100.64.0.0/10 range and can complicate port forwarding and certain network features.
What is a /24 network? +
A /24 network has 256 total addresses (254 usable hosts), with subnet mask 255.255.255.0. It's the most common subnet size for small-to-medium networks. The /24 comes from having 24 bits for the network portion and 8 bits for hosts.
Can IP geolocation be wrong? +
Yes. VPNs, proxies, and Tor exit nodes will show the location of the server, not the actual user. Satellite internet users may geolocate far from their physical location. Corporate networks often geolocate to headquarters even if employees work remotely.
What is a TXT DNS record used for? +
TXT records store arbitrary text data in DNS. Common uses include SPF anti-spam policies, DKIM public keys, DMARC policies, domain ownership verification for Google/Microsoft services, and Let's Encrypt SSL certificate issuance challenges.
What is RDAP and how is it different from WHOIS? +
RDAP (Registration Data Access Protocol) is the modern successor to legacy WHOIS, using structured JSON over HTTPS instead of plain text. RDAP provides more consistent, machine-readable data. Our WHOIS tool queries RDAP endpoints for more reliable results.
What does it mean if my IP is flagged as a VPN or proxy? +
It means the IP is associated with VPN services, proxy networks, or hosting infrastructure rather than a typical residential connection. Some websites restrict or challenge these IPs to prevent fraud. It doesn't mean anything harmful about you personally.
What is a disposable email address? +
Disposable emails (also called throwaway or temporary emails) are short-lived addresses from providers like Mailinator or Guerrilla Mail, used to avoid giving real addresses. Our Email Checker detects these domains so you can filter them from signups.
What is VLSM? +
VLSM (Variable Length Subnet Masking) allows dividing a network into subnets of different sizes based on actual host requirements, rather than forcing equal division. This wastes less address space than uniform subnetting and is standard practice in modern network design.
Why does my mail land in spam even with SPF and DKIM configured? +
Authentication records are just one factor. Spam filters also weigh sender reputation (IP/domain history), content analysis, blacklist status, engagement metrics, and missing DMARC policy. Use our Blacklist Checker to rule out IP-level listing issues.
What is leap year and how does it affect age calculation? +
A leap year has 366 days (February has 29). People born on Feb 29 celebrate their birthday on Feb 28 or Mar 1 in non-leap years, depending on the country. Our Age Calculator handles this correctly, counting exact elapsed days.
What is the difference between DNS TTL and domain expiry? +
DNS TTL (Time to Live) controls how long a DNS record is cached by resolvers — shorter TTLs mean faster propagation when you change records. Domain expiry is when your domain registration ends and the name may be released for others to register — completely different concepts.
What is Spamhaus ZEN? +
Spamhaus ZEN is a combined blacklist that merges three Spamhaus lists: SBL (spam sources), XBL (exploited/hijacked IPs), and PBL (policy block list for IPs not meant to send email directly). It's one of the most widely used DNSBL lists in production mail servers.
Why does a DNS lookup sometimes return multiple IPs? +
Multiple A records are used for load balancing (round-robin DNS) or redundancy. CDN providers like Cloudflare and Akamai return different IPs based on your location for performance. Each IP returned is a valid server for that domain.
What is an AAAA record? +
An AAAA record (quad-A) is the IPv6 equivalent of an A record — it maps a domain name to an IPv6 address. Domains with AAAA records support IPv6 connections. Most modern domains have both A (IPv4) and AAAA (IPv6) records. Check any hostname's AAAA record live with our AAAA Record Lookup tool.
What is a CNAME record? +
A CNAME (Canonical Name) record creates an alias from one domain name to another. For example, www.example.com CNAME example.com means www.example.com resolves to wherever example.com points. CNAMEs cannot be used at the root/apex domain level.
What is a SOA record? +
A SOA (Start of Authority) record contains administrative information about a DNS zone: the primary nameserver, the zone admin email, a serial number (for tracking changes), and timing values for refresh, retry, expiry, and negative caching.
How do I check if my sending IP is blacklisted? +
Use our Blacklist Checker tool — enter your IP and it queries 15 major DNSBL lists simultaneously, returning a reputation score and listing status. If listed, each result includes a direct link to that list's delisting form.
What browsers does ToolsNovaHub support? +
All modern browsers — Chrome, Firefox, Safari, Edge, and their mobile equivalents. Internet Explorer is not supported. We recommend Chrome or Firefox for best performance with tools that use live map rendering.
What is a wildcard mask in networking? +
A wildcard mask is the bitwise inverse of a subnet mask. For 255.255.255.0 (/24), the wildcard is 0.0.0.255. Wildcard masks are used in Cisco ACLs and OSPF configurations to define which bits of an address must match exactly.
What is the difference between Reverse DNS and Forward DNS? +
Forward DNS resolves a hostname to an IP (A/AAAA record lookup). Reverse DNS does the opposite — it resolves an IP back to a hostname (PTR record lookup via in-addr.arpa). Both are important for mail server trust and network diagnostics.
Does ToolsNovaHub work offline? +
Most tools require an internet connection since they make live API calls for real-time data (geolocation, DNS lookups, blacklist checks). Tools like the Subnet Calculator, Age Calculator, and Password Generator work purely in the browser and function offline.